Calculating machine



April 13, 1937. R. L. MULLER CALCULATING MACHINE w u m 0 I Vf A me m w ouv B.

April 13, 1937. R. MULLER CALCULATING MACHINE 6 Sheets-Shed 5 Filed Feb. 3, 1934 Xxx I INVENTOR FMeHA; mfier W M 49m M ATTORNEYS April 13, 1937. R. L. MULLER 2,077,180

CALCULATING MACHINE I I Filed Feb. 3, 1934 6 Sheets-Sheet 4 I04 /0/ f k loa I :Q 56 O E INVENTOR ATTORNEYS April 1937. R. L. MULLER 2,077,180

CALCULATING MACHINE Filed-Feb. 3, 1934 6 Sheets-Sheet 5 INVENTOR gal/e171 mil/er ArroimgYs April 13, 1937. R MULLER 2,077,180

CALCULATING MACHINE Filed Feb. 3, 1934 s Sheets-sheaf e Pig. .9.

35 lag /30 INVENTOR 71 M 1 A. Hid/e1 ATTokNEYs Patented Apr. 13, 1937 UNITED STATES PATENT OFFICE CALCULATING momma Application February 3, 1934, Serial No. 709,571

4 Claims.

This invention relat Y to calculating machines and it is particularly adaptable to calculating ma chines of theten-key type although manifestly number of registers into which the amounts may be entered and accumulated and from which 10 totals may be taken at predetermined intervals.

Some of the totals may require a register of large,

capacity, while others may require only a small capacity register.

Prior to the present invention it was necessary, 15 because of a possible or occasional necessity to enter or accumulate a large total to employ a machine having the necessary multiple registers each of which was of sufficient capacity to carry .the maximum possible total, although the capac- OO ity of carrying this maximum total may be utilized very seldom.

The present invention is directed to providing a calculating machine having one or more registers, each of. which is capable of carrying or accumulating the maximum total and capable of being selectively split or divided into a plurality of registers of relatively small capacity.

It is an object of the present invention, therefore, to increase the flexibility and register capacgn ity of the calculating machine and particularly a machine of the ten-key type.

' I It is a further object of the invention to increase the register capacity of a calculating machine without appreciably increasing the size or cost thereof and with a minimum number of alterations to a standard machine.

Other objects and advantages will be apparent from the following description of one embodiment of this invention given in connection with the drawings, in which,-

Figure 1 is a left side elevation of a complete machine in normal position embodying the features of this invention, some of. the parts being cut away more clearly to show the invention, the machine being .in normal position. I

Fig. 2 is a front sectional elevation taken approximately on line 2-4 of Fig. I with the parts in normal position.

Fig. 3 is a perspective view of the pin carriage tabulating mechanism and escapement mechanism with the parts in normal position.

Fig. 4 is a sectional elevation similar to Fig. 2 with the pin carriage tabulating or control key in .depressed condition and the pin carriage tabu- 55 lated to the left section of the machine.

(Cl. ass-so) Fig. 5 is an enlarged detail of portions of Fig. 6 with the parts in position after the control key has been depressed and released.

Fig. 6 is a left side partial elevation certain parts being cut away and illustrating the printing mechanism as it is controlled by the control key, the latter being in normal position.

Fig. 'I is a detailof certain portions shown in Fig. 6 with the parts in position assumed when the control key is in depressed condition.

Fig. '7 is an enlarged detail of a portion of the cipher split and coupling device.

Fig. 8 is a detail of the pin carriage of the machine as viewed from the rear, the carriage being in normal position.

Fig. 9 is a detail of the error key and its control or associated parts.

The invention will be more easily understood I by outlining first the general provisions and novel mechanisms of the machine and then describing in detail the specific mechanisms.

The present invention provides a novel means whereby an accumulating register or registers of standard construction may in effect be split into two sections, although their structure is not changed, during certain operations, so that amounts may be entered into either the right or left sections of the machine or, during certain other operations, into a complete register operated at its full capacity. The arrangement provides a more flexible machine and one in which a greater number of accumulating registers or sections may be had.

For instance, if .a standard machine was equipped with four registers each having fourteen pinions the present invention would split one or more of the registers into two sections of seven pinions each so that assuming that all of the registers were split the machine would then have eight registers of seven pinions each or if three registers were split and one was not, the machine would then have seven registers, one of fourteen pinion capacity and six of seven pinion capacity each, or the machine could be operated as a stand ard machine of four registers of fourteen pinion capacity each. Such a construction provides greater flexibility and increwes the possible uses to which the machine may be put.

General calculating machine features The invention is shown applied to a Burroughs calculating machine of the type shown generally in the Hopkins Patent 1,336,904 issued April 13, 1920, and more particularly to a calculating machine of this type but embodying a drum type there being an index bar for each key. When oneof theamount keys 2is depressed its lever 2 is rocked clockwise as viewed in Fig. l and the rear n at It (Figs. 2 and 4).

end of the lever raises its index bar 2.

An item entered on the amount digit keys is indexed in a laterally movable pin carriage 2. Mounted in this pin carriage are a pluralityof rows of movable pins 1, the diflerent rows corresponding to the different orders of the machine, such as units, tens, hundreds, etc. The pin carriage is urged to the left as viewed from the front of the machine by a spring 2 (Figs. 2 and 6) and its lateral movement is. under control of an escapement mechanism so that the pin carriage will move one space to the left after each digit or amount key has been depressed and released.

The escapement mechanism is preferably of the type shown in the heretofore mentioned Hopkins patent or similar to that shown in Thieme 1,143,240. This mechanism is operated each time an amount or digit key is depressed and comprises a vertical slidable member l2 (Figs. 4 and 5) which carries a blade I i upon its lower end engageable by each of the key levers 2 to raise the member ill. The upper end of member II is connected to an escapement dog i2 having a nose i2 (Fig. 5) engaging the teeth the pin carriage 6. Upon vertical movement of the member iii the nose I 2 of dog i2 is raised out of engagement with the rack but before disengagement of the nose occurs, a narrow finger I! (Fig. 4)

. moves into a space between two rack teeth and permits only a slight leftward movement of the pin carriage when the nose l2 clears the rack. Upon return movement of the depressed key, the finger i5 moves out of engagement with the rack, which releases the carriage, but the nose I 2 reengages a succeeding tooth of the rack to limit the complete movement of the pin carriage to one tooth space.

In the machine of the Hopkins and Muller patents the first amount key depressed raises its corresponding pin 1 in the first row of pins in the left end of the carriage and when the key is released the carriage steps over a space so that the next row of pinsv comes over the end of the index 'bars 5. The second key depressed then sets up a pin in the second row and the pin carriage subsequently moves another space to the left. This operation continues until the entire item has been set up in the traveling pin carriage, i. e., the pin carriage travels through the successive positions starting from the normal position shown in Fig. 2 yntil the carriage has passed beneath all of the pins in the pin carriage or selected section thereof as will be explained.

After the pins 1 have been set the machine is given acycle of operation during which the pin carriage 6 is raised by being swung about its pivof the rack l4 movable with stores these pins. The stops of pins or stops. This sets up stops 22 in the stationary field corresponding to the pins that were set up in the traveling pin carriage 6.

The stops in the stationary field act as stops for a plurality of actuator racks 2| having pin and slot connections to pivoted arms 22 (Fig. l) permitting horizontal movement of the racks. The racks have stop lugs 22 (Figs. 1 and 6) on them adapted to engage any of the pins 22 that may be projected. These racks are normally held rearward by a ball 24 in front of the arm 22 (Fig. l) but during the forward stroke of operation of the machine this bail moves forward and releases the arm 22so as to permit springs 25 to move the actuator racks forward to diiferential positions. All racks to the left of the amount indexed are prevented from moving forward by means of plate 22 (Fig. 2) which extends the full length of the stationary field of pins and is carried by the pin carriage and which sets up all cipher or zero stops 22 to the left of the indexed amount during upward movement of the pin carriage.

The racks 2| carry type 27 (Figs. 1 and 6) at their front ends and after the racks have been differentially positioned, a printing mechanism including hammers 22 is operated to print the item that has been entered.

Front and rear registers 20 and 2i are provided. I

the front-register 22 being of the magazine type comprising a rotatable wheel or drum such as is shown in the heretofore mentioned Muller patent providing a multiple series of registers.

The multiple register magazine comprises a rotatable reel 22 (Fig. 1) Journaled on a stud 22 supported in a suitable frame plate 24 attached to the frame 25 of the machine. The rotary magazine is urged clockwise as shown in Fig. 1 by a spiral spring (not shown) a clockwise direction is governed by an escapement mechanism (not shown). This escapement mechanism may be controlled by the carriage or by the magazine indexing key 22 either of which serves to permit clockwise steps of rotation of the magazine under the influence of its spring as is disclosed and described in the Muller Patent 1,920,477.

The mechanism for moving the selected register into and out of active position in relation to the rack has not been illustrated in detail but is disclosed in the Muller patent. A portion of this mechanism is illustrated or shown at 21 in Fig. i. This mechanism causes the registers to engage the racks at the end of the forward stroke of the machine so that upon return stroke the indexed amounts are entered in the register. At the carriage is restored to the right and the set up Pins engage a comb plate 22 (Fig. 2) which re 22 are restored by a plate III as will later be explained.

The machine is provided with a traveling paper carriage 22 supporting a platen 42 (Fig. 1). This carriage may have the usual tappets for con-- trolling certain functions of the machine as described in .the heretofore mentioned patents.

Briefly, the machine operates as follows:

After an amount has been set up in the traveling pin carriage by depressing the amount keys,

the machine is given a cycle of operation by de pressing a motor bar which causes operation of rnggppr 4| or engagement of a suitable clutch or by manipulating a hand crank if the machine is The raising of the carriage brings its pins I into engagement with vertically movable pins 22 in a stationary fleld hand operated. During the forward stroke of and its rotation in I the front reel or both the front selected register and the rear register are rocked into engagement with the racks so that during the return of the racks to normal position the amount indexed by the keys willbe added into one or both registers, after'which the pins I and 20 are restored and the selected registers are disengaged from the racks.

When a total is taken a suitable total key is depressed and the machine is given a cycle of operation during which the rack bars move forwith the racks which leaves it clear and the racks are returned to normal.

For a more detailed description of the operation of the machine and the various mechanisms heretofore mentioned reference is made to the aforementioned Hopkins and Muller patents.

Split registers As previously mentioned the machine with which the invention is illustrated is normally equipped with two registers 30 and 3 I, the former being the front register and in itself comprising a plurality of registers. In the illustrated ma.- chine the rear register and each of the front registers are of 14 pinion capacity, that is, there are 14 coaxial register pinions in each register. Each of the pinions is mounted to rotate independently of the others and 'a suitable tens transfer is provided for them, all as disclosed in the Muller patent. It is manifest, of course, that the invention may be applied to machines embodying other types of registers, such ,as that shown in the Hopkins patent, for instance.

Instead of adding more registers to the machine to increase its register capacity, the present invention enables any desired register or registers to be split into two or more registers. That is, if the front multiple register contains twenty registers of fourteen pinions each the present invention may provide forty registers of seven pinions each therein. In other words, the number of registers may be doubled, and the register capacity of the machine may be doubled. -It will be obvious that each register may be split up into other proportions if desired or even more sections.

For this purpose thepinions of each register are divided into groups or register sections, the first seven pinions on the right constituting one group or section and the seven pinions on the left constituting another group or section. Each section constitutes a complete register. Provisions are also made so that the complete fourteen pin ions of each register may be selectively used as a single register or either group of seven pinions may be used to suit the occasion and demand.

It is, of course, understood that if and when the machine is 'split'into two register. sections so that amounts can be entered and totaled in either the left or right section of the machine, amounts up to seven column capacity only can be entered in either register section.

Entries in rightsection Amounts to be entered into the right section of the machine are entered in the usual manner and without any changev in the operation other than the amount indexed in the keyboard must, of course, be within the seven column capacity. When itis desired to enter amounts in the left section of the machine the amount to be entered is first set up in the keyboard in the usual manner by which the pins 1 of the pin carriage are set up directly under the stops 2!! of the right section of the stationary pin carriage.

Entries in left section,

The present invention also makes provision for entering amounts in the left section of the register without affecting the right section of the register. The pin carriage 6 is then tabulated or stepped seven steps to the left so that the pins 1 of. the pin carriage will be positioned directly under the stops 20 of the left section of the stationary field of stops instead of the right section thereof. Therefore, when the machine is given a stroke of operation, pins 1 of the pin carriage will set up an amount in the seven left rows of stops or the left section of the stationary field of stops instead of the right section.

A control key 45 (Fig. 6) is provided for tabu lating the pin carriage approximately one-half the width of the stationary carriage, that is, seven steps to the left to cause entries to be made in the left section of the stationary field of stops and correspondingly in the left section of the register. This key 45 is similar to the other amount keys but is connected to a crank 46 instead of being connected to a key lever 3 as is shown in Fig. 1. Crank 46 (Fig. 6) is pivoted at 41 and contains an upwardly extending arm 48 to which is connected a rod 49, the rear end of which is connected to a crank 5| pivoted at 52 and having a stud connection 53 with an upwardlyextending link 54. Accordingly, when key 45 is depressed, cranks 46 and 5! are rocked clockwise and the link 54 is moved upward. Link 54 is normally urged clockwise by a spring 55 (Figs. 2,

3, 4 and 5) and its upper end is guided by a stationary bracket 51 provided with a slot 58 to permit passage and limited right and left sliding movement of the link. At its upper end link 54 terminates in a laterally extending arm 59 which engages a stud 60 of the escapement dog l2 and a laterally extending lug El (Fig. 3) which engages rack I4 prior to release of dog l2.

Adjacent each end slot 58 is provided with an enlarged opening 62 and adjacent its upper end link 54 is provided with a stud 63, (Fig. 3).

When the link 54 is in its normal or right position (Fig. 3) its stud 63 lies directly beneath the right opening 62 and therefore upon,depression of control key link 54 may mov/e upwardly during which time stud 63 moves through the opening 62 in bracket 51.

In normal position link 54 occupies the Fig. 3 position. Depression of the control key 45 raises link 54 and causes its laterally extending lug 6| to to the left where it is stopped by engagement of lug 8| with the vertical slide III as shown in Fig. 4. Upon release of control key 5 link 54 is lowered, dog I! reengages rack M and lug 6i dlsengages rack 18.

Release of control key 45 allows the link 54 to move downward, stud 83 passing through the left opening 82, whereupon escapement dog I! engages the next tooth of rack l4 and holds the pin carriage in its left position directly under the left section of a stationary field of stops. At intermediate positions link 58 is prevented from vertical movement by engagement of stud 83 with bracket 51. It will be apparent that the arrangement of the slot 58 in bracket 51, the openings 82 and the stud 63 and lug 8|, insure that the pin carriage is always moved a full seven steps or columns to the left section of the machine when it is tabulated through operation of control key .45. ,ItIt will be further understood that the amount to be entered into the register, whether it is to go into the right or. left section or whether the two sections are used as one unitary register, is always set up first, after which the .control key is depressed if the amount is to be entered into the left section as shown in Fig. 4. A stroke of operation of the machine following depression of the amount keys and depression of the control key will cause the amount to be entered into the left section beginning with the first column thereof which is the eighth column of the machine. Of course, if an amount of more than seven digits is to be entered into the machine, an entire register must be used and the control key should not be depressed.

Multiple entries Two sets of amounts may be entered and accumulated and a total taken of each so long as the capacity of each total does not exceed the seven column capacity of each section of the register. The amounts can be entered independently of either the left or right section of the machine, or both, in the same register position of the machine, with absolute disregard for the columnar position of the paper carriage. It is possible to enter first an amount in the left section of the machine by the use of the control key and then an amount in the right section of the same register by omitting to use the control key. Furthermore, amounts may be entered in either section of the register in any desired order or all amounts may be entered in one section first and then a second series of amounts entered into the second section or left section a of the register. The control key, of course, would not in any way select the register being used, but select only the right or left section of the particular register which is in active relation to the racks.

Ciphersplit and coupling devices being printed in the right seven columns or pinions. of the register. Therefore there must be a cipher split mechanism between the seventh and eighth racks. Likewise printing must be prevented and nonadding must be accomplished in the seven register pinions not being used.

In order to better understand the cipher split or the prevention of printing ciphers in the right section of the machine when the left section is receiving entries, the printing mechanism must be understood. Therefore, the printing mechanism will be described briefly. The printing mechanism is substantially the same for each order of the machine, hence only one order or column will be described.

Referring particularly to Figs. 6 and 'l, the power for operating the printing mechanism is supplied by shaft 6| which is rocked clockwise and returned counter-clockwise during each cycle of operation of the machine. A firing member 85 normally urged clockwise by springs 86 is pivoted loosely on the shaft 68 and is provided with a tail 81 engageable with a latch 68 pivoted at 89. The rear end H of this latch is normally in front of the tail 6! of the firing member and the front end of the latch has a nose 12 normally engaged in a slot 13 in its rack bar.

As long as the rack bar remains in normal position (Fig. 6) the latch remains in the position of Fig. 6 and the firing member is blocked against movement. When the rack bar moves forward the cam edge of the notch 13 in the rack bar moves latch 68 clockwise and releases the firing member which member, however, will not immediately move its printing hammer.

The firing member carries a stud ll (Fig. 6) positioned above a tall 18 of the hammer 28 pivoted at 11. This hammer is locked against -movement by a latch 18 hooked over a stud 19. This latter latch 18 has a tail 8| in the path of a tripping rod 82 on an arm 83 carried by shaft 84.

Assuming that the machine is given a cycle of operation and that the rack bar 2| has moved forward to release its latch 88, the shaft 64 continues to move clockwise and near the end of the forward stroke of the machine the stud 82 on arm 83 engages the tail ill of latch 18 and releases said latch. Ihereupon the hammer is 'quickly fired to printing position by the firing member 65 which is moved under the tension of the springs 66.

In the so-called standard machine provision is made for printing ciphers to the right of the last indexed rack by having each of the latches 68 provided with a projecting lug 85 which overlaps the adjacent latch 68 to the left. Accordingly, when a latch 88 in a given order is released by the movement of its rack bar, the latches 88 in all orders to the right will also be released which means that the printing hammers in all orders to the right of the last indexed rack will be fired during the cycle of operation of the machine.

That is, in any order to the right in which the rack bars have not been released the zero types will be struck to print zeros or ciphers.

It is not desired to print zeros to the right of the left section of rack bars when the register is split and the left section is used for listing and accumulating. To avoid this the projecting lug 85 between the latches of the two groups, that is, between the seventh and eighth latches is omitted. Consequently, no ciphers orzeros will be printed to the right beyond the units order of the left group.

As previously stated, the present machine is flexible and is also adapted to use all of the register pinions of each register as a single register, whenentering amounts exceeding seven columns capacity. 'When the entire register is used it is necessary to print ciphers to the right of the last indexed rack. For such operations the split between the seventh and eighth hammers and their latches is coupled by means of a slide 90 (Fig. '1) having a fork and stud connection 9| with the crank 92 pivoted at 93 to the printing frame 94 and having a rearwardly extending arm 95 to which is attached the upper end of a link 91 for purposes later to be described.

In the normal position of the machine, that is, when the full capacity of the machine is available, the slide 90 is in its forward position as shown in Fig. 6 and a stud 98 on slide 90 is then positioned directly under the lug 99 (Fig. 6) of latch 69 in its seventh column so that if the latch 68 in the eighth column is released to print the stud 98 will engage lug 99 and operate latch 68 in the seventh column which in turn will release all the latches of the lower orders so that ciphers are printed down through the entire register.

Whenever, however, the machine is conditioned to enter amounts in the left section only caused by depression of the control-key the crank 92 is moved counterclockwise and slide 90 is moved rearward placing its stud 98 out of range of the lug 99 of the seventh column (Fig. 7) thus splitting the cipher printing mechanism so that ciphers will not be printed in the orders below the eighth column. As previously stated the overlapping lug 95 of the latch in the seventh column is omitted so that it does not overlap the latch in the eighth column thus relying entirely on the slide and its stud for causing printing of the ciphers when the two sections are coupled together during the full capacity operation of the machine.

The mechanism for controlling the slide from the control key is as follows:

Connected to-the lower end of link 91 (Figs 6 and 2) is a lever IOI pivoted at I02 to the machine frame and terminating in a hooked arm I03 which engages a stud I04 projecting from the vertical link 54 previously referred to (Figs. 2, 3 and 4) When the control key is depressed, link 54 is moved upward as heretofore described and stud I04 engages and rocks lever IOI slightly in a counterclockwise direction as indicated in dot and dash lines in Fig. 2. This movement of lever 54 moves slide 90 (Fig. 7) rearward so that the latches are split and ciphers will not be printed to the right of the eighth column.

It will be recalled that the control key is depressed and released prior to a machine operation and therefore means has been provided to latch slide 90 in its rearward position during the entire machine operation. This means consists of a member I06 (Figs. 6 and '7) pivoted at I01 and having a notched extension I08 at its lower end which engages a'lateral lug I09 of link 91. When the control key is depressed and the crank 92 is rocked counterclockwise as shown in Fig. 7,

notch I08 engages lug I09 and retains the parts in cipher split position during the entire ma.- chine operation. At the extreme end of each and every machine operation latch I06 is released by plate I II (Figs. 1, 6 and 7), which plate also serves to restore all of the indexed stops 20.

Plate III is pivoted at the left side of the machine as shown in Fig. 1 and is provided with arms extending to the right and between each row of stops20. Plate III is connected by a link II2 (Fig fi to a crank II3 having a pass-by pawl 4 which is engaged by a crank pin II5 carried by a crank IIG. During each operation crank I I6 moves clockwise and causes its pin H5 to pass over pawl II4 without affecting the comb plate III. During the return stroke of the machine crank pin II5 engages pawl H4 and lowers link II2 moving the comb plate III downward to restore all stops 20. During the downward movement of plate III it engages a rearwardly extending arm I" of lever I05 and releases the latched lever 92 allowing the cipher control slide 90 to return from its Fig. 7 to its Fig. 6 position.

Rack bar split As previously stated when amounts are entered in the left section of the machine it is also necessary to prevent rack bar movement in the right section of the machine in addition to splitting the cipher printing and corresponding latches. To accomplish this all the zero stops 20 in the right hand section of the machine are set up upon depression of control key 45. It will be recalled that depression of control key 45 rock's crank 92 counterclockwise from Fig. 6 to Fig. 7 position. Connected to the stud 9| is a rod I20 which extends rearwardly where it is connected with one arm I2I of the lever I22 shown more clearly in Figs. 6, '7, and 8. Lever I22 is pivoted at I23 to the pin carriage guide and terminates in an upwardly extending ledge I 24 which when raised engages each of the cipher stops 20 of the right section of the stationary field of stops.-

Depression of the control key 45 by rocking crank 92 moves rod I20 rearward and rocks lever I22 until the ledge I24 thereof is moved from the Fig. 6 to the Fig. 7 position where it is directly under the rearward extensions of the cipher stops 20 of the right section of the machine. Accordingly. when the machine is given a stroke of operation and its pin carriage is raised upward to set the stationary stops in the left section of the machine the cipher stops in each row of the right section of the machine are also set up to prevent movement of the racks in the right section of the machine.

From the foregoing it will be seen that the control key performs three functions, these functions being necessary when the machine is split. That is, operation of the control key causes the pin carriage to escape or tabulate to the left side of the machine, splits the printing latches so that ciphers will not be printed in the right section of the machine, and sets up all the cipher index stops in the right section of the machine to prevent rack bar movement in the right section.

Totaling employed to accumulate a single column of figures as in the standard machine when the entire re isteris employed to accumulate, a total can be immediately taken which will totalize the registers including all fourteen pinions thereof.

If the register has been used in split condition for divided listings in which a separate column of figures has been entered in one or both the left and right sections of the machine, it is necessary to depress the control key 45 at the same time that the total key is depressed and before the machine is given a strokeof operation. De-

' pression of the control key at this time causes the usual escapement of the pin carriage, but this is an idle movement because no pins are set up. The depression of the control key causes the cipher split device to be moved from the Fig. 6

position to the Fig. 7 position and accordingly prevents printing of ciphers to the right of the eighth rack. Then when the machine is given a stroke of operation, the total of the left section and the total of the right section are printed simultaneously during the same machine operation if both sections contain totals. Ciphers are not printed between totals. In total taking neither plate 26 nor ledge I can cause the zero pins to be set up because, although ledge I 24 is in position beneath the zero pins 20 for the right section, the traveling pin carriage I and its guide are not raised in total taking operations. It is apparent, of course, that if the control key had not been depressed during a total operation ciphers would be printed to the right of the eighth rack between the two totals. The depression of the control key during a totaling operation is merely employed to prevent this printing of ciphers to the right of the eighth column during a total operation.

Error key An error key is provided similar in construction and operation to that shown in the Thieme Patents 1,283,597, 1,143,240 and 1,321,260 and the Hopkins Patent 1,336,904. As disclosed in these patents, ii an error is discovered after an amount has been entered or before the machine is given a stroke of operation the error key may be depressed and will function to restore the pin carriage and all pins to zero position. Furthermore, in accordance with this invention depression of the error key made even after depression of control key will also restore the latchings from the Fig. 7 position to the normal or Fig. 6 pom- I06 is retained in the Fig. 7

tion. This mechanism is shown more clearly in Fig. 9 in which the error key I30 is shown and is movable horizontally. When the error key I" is depressed or moved rearwardly in a horizontal direction it moves a bar III rearwardly, which bar has a projection I32 extending upwardly therefrom. This projection engages and rock a lever III in a counterclockwise direction as viewed from above. This lever engages the lower end of a vertical lever I which extends upwardly as shown more clearly in Fig. 8 it being pivoted at I35 to the machine frame. and continues upwardly and terminates in an arm I" which engages a stud III in lever I.

After an amount has been entered in the keyboard and the control key 4' depressed, lever position. If. however, the error key is depressed at this time, lever I33 will berocked counterclockwise and will in turn rock levers I34 and I" counterclockwise thus restoring the cipher split mechanism from the Fig. 7 to the P18. 6 position.

From the foregoing description it will be apparent that a machine is provided which is normally in condition to enter and accumulate amounts to the full capacity of any of' the registers, but which when the control key is depressed at any selected time is in condition to enter and accumulate amounts in either section of a split register. Amounts may be entered in either the left or right-section oi the register, or both. Theforegcing is accomplished by the mere depremion of a control key and does not require any structural changes in the machine.

Furthermore, it is of particular advantage that the foregoing flexibility is attained by a minimum change to present constructed or so-called standard machines.

The present machine also has the eil'ect of doubling the register capacity; that is, if a certain machine has a given number of registers for what may be termed standard operation, the registers can be increased up to double its full capacity by merely splitting any or all registers desired. Furthermore, the register or registers which are to be divided or split may be selected from any one or all of the registers in the machine.

The operation of the machine is substantially no diflerent than the operation of the usual machine. The setting up of the amounts on the keyboard is exactly the same as in the standard machine and it is only necessary to depress the control key when it is desired to split the section or take a total from its previously split register entry.

It will be apparent to those skilled in the art that the foregoing description discloses only one possible embodiment of this invention, that the invention may be incorporated in other types of machines. and that changes may be made in the details of the illustrated construction without departing from the spirit and scope of the appended claims.

I claim:

1. A calculating machine having a register, a single set of ten amount keys, plural order differential and printing mechanisms controlled by said keys for normally entering an amount indexed in said keys in certain orders of said register and printing said amount by corresponding orders of said printing mechanism, said print ing mechanism having means normally operative for causing automatic printing of ciphers to the right of the orders in which digits are indexed,

' a control key, means controlled thereby when said key is in one position for causing an amount indexed on said keys to be entered in certain orders of said register differing from said first mentioned orders and to be printed by corresponding diil'erent orders of said printing mechanism, and means conditioned by said control means when in said position for temporarily splitting said printing mechanism to disable the means for causing automatic printing of ciphers to theright of the orders in which said latter mentioned amount is printed. said latter means being automatically returned to normal condition at each cycle of machine operation.

2. In a calculating machine, a register, a single set of manipulative amount keys, a plural order differential mechanism controlled by said keys for normally entering amounts indexed by said keys in predetermined orders of said register, a plural order printing mechanism normally operable to print in predetermined orders for printing amounts entered upon said keys and totals thereof, a control key, and means conditioned thereby when said key is in one position for causing an amount entered upon said single set of keys to be entered by a single machine operation in orders diii'ering from said predetermined orders of said register and to be printed by corresponding diil'erent orders of said printin mechanism, and means normallyinoperative bf conditioned by said control key when in said position for temporarily preventing printing by the orders of the printing mechanism corresponding to the unused orders of the register. said latter means being automatically returned to normal condition at each cycle of machine operation.

3. In a calculating machine, a register, a single set of manipulative amount keys, a plural order differential mechanism controlled by said keys for normally entering amounts indexed by said keys in predetermined orders of said register, a plural order printing mechanism for printing amounts entered upon said keys and totals there- 10 of, normally inoperative means for splitting said printing mechanism, a control key, and means conditioned thereby when said key is in one position for causing an amount entered upon said single set of keys to be entered by a single machine operation in orders differing from said predetermined orders of said register and to be printed by the corresponding different orders of said printing mechanism, normally inoperative means conditioned by said control means when in said position for preventing printing by the orders of the printing mechanism corresponding to the unused'orders of the register, a latch for said latter means, and means for releasin said latch at each cycle of machine operation. 4. In a calculating machine, aregister, a single set of manipulative amount keys, a plural order differential mechanism controlled by said keys for norm-ally entering amounts indexed by said keys in predetermined orders of said register, a plural order printing mechanism for printing amounts entered upon said keys and totals thereof, said printing mechanism having means normally operative for causing automatic printing of ciphers to the right of the orders in which digits are indexed, a control key, means conditioned thereby when said key is in one position for causing an amount to be entered by a single machine operation in orders differing from said predetermined orders of said register and to be printed by the corresponding different orders of said printing mechanism, means conditioned by said control key when in said position for temporarily splitting said printing mechanism to disable the means ior causing automatic cipher printing, a latch for said splitting mechanism to retain the latter in. splitting condition, and means for releasing said latch at each cycle of machine operation.

ROBERT L. MULLER. 

